How to Play Sandwich Sudoku

THE PLAYBOOK · PLJTSS

How to play Sandwich Sudoku

Read the aim of Sandwich Sudoku, then make your first move. Solve the Sudoku while each outside clue gives the sum strictly between 1 and 9 in that row or column. Check the relevant rule before repeating a move. Compare the starting position with the example in the Guide. Look at what changes after your first action.

This collection contains 8 puzzles. Progress is saved in this browser. The same puzzle can appear again; the collection is not labelled with calibrated difficulty levels.

Notice the feedback

Watch the feedback after an action. A message can explain whether the input was accepted or whether a rule needs attention. Use the example to check your reasoning.

Your goal

Solve the Sudoku while each outside clue gives the sum strictly between 1 and 9 in that row or column. Read that aim before choosing your first action. The example below illustrates a decision.

Step by step

1. Select an editable cell.
2. Enter a value using the keypad or keyboard; Notes stores candidates.
3. Read the region, cage, arrow or outside clues alongside the normal constraints.
4. Check entries verifies the completed board; Undo reverses your last input.
5. New puzzle selects another included puzzle.

Controls

Click or tap cells and the digit pad. Use Notes, Undo and Reveal selected. Large boards scroll inside the game. Keep the playing area visible while using these controls. Avoid pressing the same control repeatedly while a move is being processed.

A useful example

If the values strictly between 1 and 9 are 2, 4 and 7, the sandwich clue is 13. Apply the same reasoning to the position in your own round. Check the stated objective.

Watch out for this

A full board must obey every extra rule. Reveal supplies assistance; it is not an earned deduction. Check the rule before repeating the action. Locate the buttons and input area before beginning a long round. Use the on-screen labels to avoid an accidental restart.

Common questions